/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.nacos.config.server.utils;

/**
 * 合成dataId+groupId的形式。对dataId和groupId中的保留字符做转义。
 * 
 * @author jiuRen
 */
public class GroupKey {

    static public String getKey(String dataId, String group) {
        StringBuilder sb = new StringBuilder();
        urlEncode(dataId, sb);
        sb.append('+');
        urlEncode(group, sb);
        return sb.toString();
    }

	static public String getKeyTenant(String dataId, String group, String tenant) {
		StringBuilder sb = new StringBuilder();
		urlEncode(dataId, sb);
		sb.append('+');
		urlEncode(group, sb);
		if (StringUtils.isNotEmpty(tenant)) {
			sb.append('+');
			urlEncode(tenant, sb);
		}
		return sb.toString();
	}
    
	static public String getKey(String dataId, String group, String datumStr) {
		StringBuilder sb = new StringBuilder();
		urlEncode(dataId, sb);
		sb.append('+');
		urlEncode(group, sb);
		sb.append('+');
		urlEncode(datumStr, sb);
		return sb.toString();
	}
    
    static public String[] parseKey(String groupKey) {
        StringBuilder sb = new StringBuilder();
        String dataId = null;
        String group = null;
        String tenant = null;

        for (int i = 0; i < groupKey.length(); ++i) {
            char c = groupKey.charAt(i);
            if ('+' == c) {
				if (null == dataId) {
					dataId = sb.toString();
					sb.setLength(0);
				} else if (null == group) {
					group = sb.toString();
					sb.setLength(0);
				} else {
					throw new IllegalArgumentException("invalid groupkey:" + groupKey);
				}
            } else if ('%' == c) {
                char next = groupKey.charAt(++i);
                char nextnext = groupKey.charAt(++i);
                if ('2' == next && 'B' == nextnext) {
                    sb.append('+');
                } else if ('2' == next && '5' == nextnext) {
                    sb.append('%');
                } else {
                    throw new IllegalArgumentException("invalid groupkey:" + groupKey);
                }
            } else {
                sb.append(c);
            }
        }
        
		if (StringUtils.isBlank(group)) {
			group = sb.toString();
			if (group.length() == 0) {
				throw new IllegalArgumentException("invalid groupkey:" + groupKey);
			}
		} else {
			tenant = sb.toString();
			if (group.length() == 0) {
				throw new IllegalArgumentException("invalid groupkey:" + groupKey);
			}
		}
       
        return new String[] { dataId, group, tenant };
    }
    
    /**
     * + -> %2B
     * % -> %25
     */
    static void urlEncode(String str, StringBuilder sb) {
        for (int idx = 0; idx < str.length(); ++idx) {
            char c = str.charAt(idx);
            if ('+' == c) {
                sb.append("%2B");
            } else if ('%' == c) {
                sb.append("%25");
            } else {
                sb.append(c);
            }
        }
    }

}
